Conor Anthony McGregor is an Irish mixed martial artist, boxer, and kickboxer born on July 14, 1988, in Crumlin, Ireland.

McGregor also has a background in taekwondo and has worked as an actor alongside his combat sports career. He uses both English and Irish in his public life, making him one of the relatively few professional fighters at the international level who speaks Irish. He has competed across multiple combat disciplines, including mixed martial arts, kickboxing, boxing, and taekwondo.

In the UFC, McGregor claimed the featherweight championship and then the lightweight championship, becoming the first fighter in the organization's history to hold titles in two weight classes at the same time. That achievement — the UFC Featherweight Championship and the UFC Lightweight Championship held concurrently — stands as a defining point in his professional record. He was also a simultaneous featherweight and lightweight champion in Cage Warriors Fighting Championship. In 2016, Time magazine recognized him with its Time 100 award.

McGregor's career has spanned mixed martial arts, kickboxing, boxing, taekwondo, and acting, and his status as the first UFC fighter to hold championships in two weight classes simultaneously remains the concrete distinction that sets his competitive record apart within the promotion.